High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! The Collared Titi, Callicebus torquatus, is a species of titi, a type of New World monkey, from South America.The genus was recently revised from the Hershkovitz concept of three species to thirteen neotropical species with three subspecies of Callicebus torquatus known for Colombia (Hershkovitz, 1990, 1988a). Groves (2001) elevates C. t. medemi to Callicebus medemi and Van Roosmalen et al. (2002) elevate all of the subspecies to species. These last changes were made with few arguments to support the changes and were made apparently influenced by the increasing use of the so-called phylogenetic species concept, which seeks to define species as the “smallest diagnosable cluster of individual organisms within which there is a parental pattern of ancestry and descent” (Cracraft (1983).

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